School of Fashion Engineering, Shanghai University of Engineering Science, Shanghai 201620, People's Republic of China.
Nanotechnology. 2020 Jan 24;31(5):055702. doi: 10.1088/1361-6528/ab442c. Epub 2019 Oct 31.
Filtering of industrial PM is a major challenge for global environmental and animal protection. Filtering of materials with excellent thermal stability and other comprehensive performances is required for the removal of fine particles in high-temperature operating industries such as steel, cement, metallurgy, incineration, etc. In this study, a meta-aramid/polysulfone-amide (PMIA/PSA) composite nanofibrous filtration membrane is prepared via solution electrospinning for the development of high-temperature-resistant filtering products. To maximize the merits of each component, PMIA/PSA composite nanofibrous membranes with different mass blending ratios are prepared to determine the optimal balance. It is found that the PMIA/PSA composite nanofibrous membranes show excellent thermal stability and thermal shrinkage performance. They also maintain superb mechanical retention ratios after 200 h treatment at 200 °C. In addition, they exhibit excellent removal efficiency of polystyrene aerosol (PSL) particles of various sizes. It is found that the removal efficiency of PMIA/PSA (3/7) is 96.7% for 0.1 μm, 98.3% for 0.2 μm and 99.6% for 0.3 μm particles and it possesses optimal filtration resistance (79 Pa), while other composite membranes can reach a removal efficiency of over 99.7%. Our experimental results illustrate that the filtration efficiency for PM of PMIA/PSA (7/3), (5/5) composite nanofibrous membranes is still kept as high as 99.9% even after being treated at 200 °C for 120 h. It indicates that the prepared composite nanofibrous membranes have potential for applications where high-efficiency filtration is desired, such as bag dust filters for use under high temperatures.
工业 PM 的过滤是全球环境和动物保护的主要挑战。需要具有优异热稳定性和其他综合性能的材料来过滤高温作业行业（如钢铁、水泥、冶金、焚烧等）中的细颗粒。在这项研究中，通过溶液静电纺丝制备了一种间位芳纶/聚砜酰胺（PMIA/PSA）复合纳米纤维过滤膜，用于开发耐高温过滤产品。为了最大限度地发挥各组分的优点，制备了不同质量混合比的 PMIA/PSA 复合纳米纤维膜，以确定最佳平衡。结果发现，PMIA/PSA 复合纳米纤维膜具有优异的热稳定性和热收缩性能。在 200°C 下处理 200 小时后，它们仍保持出色的机械保留率。此外，它们对各种尺寸的聚苯乙烯气溶胶（PSL）颗粒表现出优异的去除效率。结果发现，PMIA/PSA（3/7）对 0.1μm 的去除效率为 96.7%，对 0.2μm 的去除效率为 98.3%，对 0.3μm 的去除效率为 99.6%，且具有最佳的过滤阻力（79 Pa），而其他复合膜的去除效率可以达到 99.7%以上。我们的实验结果表明，即使在 200°C 下处理 120 小时后，PMIA/PSA（7/3）、（5/5）复合纳米纤维膜的 PM 过滤效率仍保持在 99.9%以上。这表明所制备的复合纳米纤维膜具有在高温下使用的高效过滤所需的应用潜力，例如高温袋式除尘器。
